Plasmonic Light Emitting Device for Cross-Contamination-Free RGB Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for patterning and stacking red-green-blue (RGB) quantum dots into high-resolution pixels over large areas face challenges such as cross-contamination and incompatibility with standard semiconductor processing technologies, and are time-consuming due to the need for separate mixing and deposition of different colors.
Innovation Solution
A light emitting device incorporating a plasmonic structure with localized surface plasmon resonances, a broadband light emitting layer with an emission spectrum overlapping the plasmonic resonances, and a spacer layer for exciton-plasmon coupling, allowing for tunable color emission and integration into LED structures, enabling control over polarization, beam direction, and phase of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography and spincoating techniques are used to pattern RGB quantum dots, then high resolution pixels can be achieved, but cross-contamination occurs between RGB pixels
Solution Approach 1:
A charge transport layer is introduced as an intermediary between the substrate and the quantum dot layers. This layer enables exciton-plasmon coupling to occur within the layer itself, preventing direct contact between quantum dots of different colors and eliminating cross-contamination while maintaining high resolution patterning capability
Solution Approach 2:
The invention replaces mechanical mixing and separate deposition processes with exciton-plasmon coupling occurring within the charge transport layer. This substitution eliminates the need for precise mechanical patterning of each color layer separately, reducing cross-contamination risks
2Object-affected harmful factors
If inkjet printing or transfer printing methods are used to deposit different RGB quantum dots, then cross-contamination is avoided, but the methods are not compatible with standard semiconductor processing technologies
Solution Approach 1:
The charge transport layer serves multiple functions simultaneously: it transports charges, enables exciton-plasmon coupling, and acts as the medium for color generation through localized surface plasmon resonances. This multi-functionality allows the structure to be integrated into standard semiconductor LED processing workflows
Solution Approach 2:
The invention merges the charge transport function with the color generation function by enabling exciton-plasmon coupling within the charge transport layer itself. This consolidation eliminates the need for separate color deposition steps, making the process compatible with standard semiconductor manufacturing
3Object-affected harmful factors
If different RGB quantum dots are deposited separately using printing methods, then cross-contamination is prevented, but the process is time-consuming
Solution Approach 1:
Multiple quantum dot layers of different colors are merged into a single charge transport layer where exciton-plasmon coupling occurs. This allows all color layers to be deposited simultaneously or in fewer steps rather than separately, dramatically reducing the total deposition time while preventing cross-contamination
Solution Approach 2:
The charge transport layer is prepared in advance with the appropriate properties to enable exciton-plasmon coupling. This preliminary preparation allows subsequent quantum dot deposition to occur more efficiently, as the coupling mechanism is already in place to guide exciton energy transfer without requiring precise sequential deposition of each color
4Adaptability or versatility
If a broadband light emitting layer is used with plasmonic structures, then color tunability is achieved, but the structure becomes more complex
Solution Approach 1:
The charge transport layer is designed to perform multiple functions: charge transport, exciton-plasmon coupling, and color generation through localized surface plasmon resonances. This multi-functionality reduces the need for additional separate components, managing structural complexity while achieving broad color tunability
Solution Approach 2:
Color tuning is achieved by modifying parameters of the existing charge transport layer structure, such as the periodicity and dimensions of the plasmonic nanostructures, rather than adding entirely new components. This approach enables color control while maintaining relatively simple device architecture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves tunable light emission with sub-wavelength spatial resolution, allowing for the production of colors with varying hues and tones in a single patterning step, enhancing color saturation and intensity, and is compatible with standard semiconductor processing.
Implementation Method 1
a plasmonic structure configured to have a plurality of localized surface plasmon resonances
Implementation Method 2
The spacer layer may comprise a thickness configured to enable exciton-plasmon coupling between the broadband light emitting layer and the plasmonic structure
Implementation Method 3
a broadband light emitting layer comprising an emission spectrum substantially overlapping wavelengths of the localized surface plasmon resonances
Implementation Method 4
The plasmonic structure may be configured to control at least one of a polarization, beam direction and phase of light emitted by the broadband light emitting layer
Data Source
AI summary
A light emitting device, a method of fabricating a light emitting device and a method of controlling light emission. The light emitting device includes a plasmonic structure. The plasmonic structure is configured to have a plurality of localized surface plasmon resonances. The light emitting device also includes a broadband light emitting layer having an emission spectrum substantially overlapping wavelengths of the localized surface plasmon resonances. A spacer layer is disposed between the plasmonic structure and the broadband light emitting layer. A color of light emitted by the broadband light emitting layer is tunable by the localized surface plasmon resonances of the plasmonic structure.